I use Brass if I need to write assembly on my computer. There are also some great oncalc programs such as AsmDream and Mimas.BrassAsmDream (uses the BASIC program editor and has great macro support)Mimas (An IDE on the calc)

EDIT: I use Windows 7 on a 64-bit computer.

47%? Take a look and try to imagine how cool 100% will be. This has won zContest 2011 and made news on TICalc. This compromise between Assembly and BASIC parses like BASIC and is fast like assembly. Grammer 2

oh dear, I made batch files to compile apps, but for programs, I would use the DoorsCS7 SDK which makes life much easier when making programs. (It uses Brass, too, but has all sorts of extra include files, batch files to make compiling more automated, et cetera).DCS7 SDK
Sorry about that :/ If you are making an App, my header looks like this:

47%? Take a look and try to imagine how cool 100% will be. This has won zContest 2011 and made news on TICalc. This compromise between Assembly and BASIC parses like BASIC and is fast like assembly. Grammer 2

So say your source code is in a .txt file called "source" and you want its name to be NOTBASIC:

@echo off
cd asm ;change directory to the asm folder
copy ..\source.txt source\NOTBASIC.asm ;copy source.txt to the appropriate directory, but name it properly
compile NOTBASIC ;compile it

47%? Take a look and try to imagine how cool 100% will be. This has won zContest 2011 and made news on TICalc. This compromise between Assembly and BASIC parses like BASIC and is fast like assembly. Grammer 2

There is also a fairly nice compiler if you have internet called ORG. If you create an account, they will save your projects, too. All you need to do is put in the source code and Compile As and it spits out a download. Then you don't have to worry about all that compatibility stuff :3

47%? Take a look and try to imagine how cool 100% will be. This has won zContest 2011 and made news on TICalc. This compromise between Assembly and BASIC parses like BASIC and is fast like assembly. Grammer 2